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VIVOTEK
User's Manual - 51
Exposure control:
■
Exposure level: You can manually set the Exposure level, which ranges from -2.0 to +2.0 (dark
to bright). You can click and drag the semi-circular pointers on the Exposure time and Gain
control slide bars to specify a range of shutter time and Gain control values within which the
camera can automatically tune to an optimal imaging result. You may prefer a shorter shutter
time to better capture moving objects, while a faster shutter reduces light and needs to be
compensated by electrical brightness gains.
■ Maximum
Gain control: Tune the slider bar to set the Gain Control to the best image quality.
Higher gain control value will generate a certain amount of noise, and that the gain control,
lighting levels, and picture performance are closely related.
Firmware will then automatically tune the Gain, Exposure time, and Iris opening within the ranges
you specied.
■
WDR Pro : When enabled, you can select the strength of the WDR function. The Low, Medium,
High options correspond to the level of contrast between the overly-lit area and the shaded areas.
For example, the High option applies to a high contrast scenario. Note that when the exposure
time is set to longer than 1/60 second, the WDR function will be disabled.
The Sensitivity option applies to the response speed to the change in bright-to-dark lighting
contrast.
■ Custom: This option allows you to manually add a specific window as a measuring area. The
measuring window refers to “weighted window“ where the lighting condition within the particular
area is taken into account. Camera firmware then adopts the weighted averages method to
calculate the value.
Window
■ BLC: When selected, a BLC window will appear on screen meaning that the center of the scene
will be taken as a weighed area. This option enables light compensation for images that are too
dark or too bright to recognize; for example, for the dark side of objects that is posed against
bright sunlight.